I think what you are describing is Unity's output when you build a game. That should look something like the attached photo. These files are just what's necessary to run the game on a desktop, and they are not the source code, so posting only these probably would disqualify you. Unity encrypts your assets when you build a game, so the judges can't view your work if you post this alone.

The source code is what Unity looks at BEFORE you build the game. Source code is the un-encrypted project files. The source code is wherever your project folder is, the same folder you open in the Unity Hub when you launch the Unity Editor. If you don't know where that is, do this:

• Open the Unity Hub,
• Right click on your project in the list,
• Select Open In Explorer,
• This will open a folder in Windows Explorer, (or whatever apple/penguin uses to browse files),
• Go in that highlighted folder,
• And there you go, that your source code.

To upload your source code for the judges, do this:

• Create a new folder somewhere
• Copy the following folders in you source code folder to this new folder:
  • "Assets", "Packages", and "ProjectSettings"
• Zip this new folder, and upload it somewhere, like GoogleDrive or something. You can even upload it to Itch.io, if it'll fit.
• Alternatively, you could zip your entire source code with all it's folders, but zipping just these few is sufficient and saves on space. Unity projects get kinda big.

Be careful about uploading copyrighted assets in your source code upload though. If you used any free assets made by other people under a creative commons license or something, just delete them from your source code copy before uploading (Just don't delete them from your original source code lol). Then leave a text file in the place of the deleted assets and maybe a note of what was deleted and where to downloads it. This seems to be fine by the judges, as far as I can tell. I've not seen explicit instructions from a judge yet on sourcing free assets in this way, but no one has complained so far.